body {
    font-size: 25px;
}

* {
    box-sizing: border-box;
}

.block {
    background: #e0d5c5;
    width: 1800px;
    height: 800px;
    overflow: auto;
    box-sizing: border-box;
    padding: 30px;
    background: #ced4db;
    border-radius: 45px 0 0 45px;
}
div {
    background: #9c8383;
    width: 350px;
    height: 300px;
    overflow: hidden;
    border-radius: 45px;
    padding: 25px;
    display: inline-block;
    box-shadow: 0px 0px 15px #1d1c1c inset;
}